I haven't actually met that many breeds. I live in an area dominated by BCs, Staffordshire Bull Terriers, Labs, Cattle dogs, and many mixed breeds, small and large.
Any breed that isn't one of the above would be considered pretty rare.
I have only ever met one whippet. Gorgeous!
I have only just met a Tibetan Terrier and Papillons are not very common at all.
Edit - It was a real eye opener for me when I went to a dog show a few weeks back for the first time. So many breed in the flesh, unfortunately I didn't get to meet all of them in the flesh. My breath was taken away by the Salukis and the Afghans... it was almost like I am a closet sighthound person... but really I think I was just amazed at their attitudes, elegance and beauty.